Grooving cutter



Feb. 4, 1941. Q BENNETT 2,230,924

GROOVING CUTTER Filed June 5, 1959 3 Sheets-Sheet 1 {ea/"ye 631562727655 INVENTOR ATTORNEYS Feb. 4, 1941. G. c. BENNET'i' 2,230,924

GROOVINGY CUTTER Filed June 5, 1939 3 Sheets-Sheet 2 fewye 556271761? INVENTOR ATTORNEYS 4 1941- 7 eye. BENNETT 2,230,924

GROOVING' CUTTER Filed June 5, 1939 3 Sheets-Sheet 3 I 172 w I36 me 145 INVENTOR ATTORNEYS Patented Feb. 4, 1941 UNITED STATES PATENT QFFICE 2,230,924 GROOVING' CUTTER George 0. Bennett, Huntsviile, Ala.

Application June 5, 1939, Serial No. 277,559

1 Claim.

My invention relates to the art of manufacturing and repairing shoes, and has among its objects and advantages the provision of an improved roughing cutter.

An object of my invention is to provide a roughing cutter fashioned to cut grooves in shoe shanks, half soles and the like wherein the cutter is provided with a series of 'blades fashioned with grooving teeth in which the toothed cutting edges are so fashioned as to eliminate friction. In addition, the blades are so designed and arranged as to facilitate grinding to the end that the grooving teeth might be effectively sharpened.

Another object is to provide a roughing cutter designed for association with the usual edge trimmer shaft of shoe machinery wherein means are employed to facilitate connection of the roughing cutter with either end of the shaft.

Another object is to provide a roughing cutter 20 including relatively thin blades provided with notched cutting edges wherein the blades and/or the cutter may be reversed for rotation in the other direction so as to maintain longer cutting life.

In the accompanying drawings:

Figure 1 is an elevational view of a roughing cutter in accordance with my invention with a part broken away for the sake of clearness;

Figure 2 is an end elevational View;

Figure 3 is a longitudinal sectional View of a cutter along the lines of Figures 1 and 2 but i1- lustrating a bolt connection between the cutter and the edge trimmer shaft;

Figure 4 is a longitudinal sectional view of'a 35 cutter along the lines of- Figures 1 and 2 but illustrating stud bolts for connecting the cutter with either end of the edge trimmer shaft;

Figure 5 is an elevational view of a cutter embodying a bolt connection such as that illustrated 40 in Figure 3 but made up of a cylindrical body having blades fixedly related thereto;

Figure 6 is a sectional view along the line 6-6 of Figure 5;

Figure 7 is a longitudinal sectional view of a cutter in which the cylindrical body is die-cast about the attaching screw with the blades cast in the cylindrical body;

Figure 8 is a sectional view along the line 8-8 of Figure '7 I Figure 9 is a longitudinal sectional view of a cutter provided with a bore for the reception of the edge trimmer shaft and adapted to be fixedly secured thereto by set screws;

Figure 10 is a sectional view along the line Ill-l0 of Figure 9; s

Figure 11 is a longitudinal sectional view of a cutter embodying a cylindrical body with blades insertable in slots illustrating stud screws for connection with either end of the edge trimmer shaft along the lines of Figure 4, with retaining 5 and aligning collars threadedly associated with the stud bolts for fixedly relating the blades to the cylindrical body;

Figure 12 is a sectional view along the line l2-- l2 of Figure 11;

Figure 13 is a longitudinal sectional view of a cutter along the lines of Figure 11 but illustrating the cylindrical body provided with a bore for the reception of the edge trimmer shaft;

Figure 14 is a sectional view along the line l5 [4-44 of Figure 13;

Figure 15 is a longitudinal sectional View of a cutter provided with a bore for the reception of the finisher shaft of the shoe machine; and

Figure 16 is an end view of the cutter of Figure 20 15 with a part broken away for the sake of clearness.

In the embodiment selected to illustrate my invention, Figures 1 and 2 illustrate a cylindrical A body M provided with extensions l6 and I8 00- axially arranged with respect to the axis of the body. Extension I6 is provided with right hand threads 20, while section I8 is provided with left hand threads 22. Extensions I6 and [8 are l adapted for threaded connection with the threaded bores in the ends of the edge trimmer shaft of a shoe machine (not shown). In providing right and left hand threads on the extensions l6 and I8, respectively, the cutter of Figs 1 and 2 may be connected with either end of the edge trimmer shaft with the threads 20 and 22 respectively arranged to prevent unscrewing of the cutter from the edge trimmer shaft, which rotates in the same direction at all times.

Cylindrical body I4 is'provided with a plurality of longitudinal grooves 24 of considerable depth to provide blades 26 extending the full length of the cylindrical body. Blades 26 are equally spaced with their front faces 28 paralleling their respective rear faces 30, and the grooves 24 are of such width as to provide considerable spacing between the blades. The cutter rotates in the direction of the arrow 32, which is also true of the edge trimmer shaft (not shown), and the blades 50 are provided with relief angles 34 at their edges, with the edges fashioned to provide teeth 36 for grooving the half sole or other work preparatory to adhesively securing the part to another part in the shoe.

In attaching half soles and connecting other parts through the medium of a suitable cement, an effective cemented joint is secured through the medium of interfitting grooves and ribs throughout the cemented joint. Teeth 36 of each blade are aligned with the teeth of all the other blades so as to effectively groove the work to the end that the two joined pieces will have clean cut interfltting rib-like formationswhich greatly increase the area of the parts in the glued or cemented joint. At the same time, such surface irregularities provide efficient anchoring surfaces for the cement.

Fig. 2 illustrates the teeth 36 as extending transversely the full width of the angular edges 34 of the blades 26. Effective work can be done only with cutters having sharp teeth, and the cutting face of the cutter must be such as to eliminate friction incident to cutters wherein the grooving faces are of wide areas concentrically arranged with respect to the axis of rotation of the cutter. The angular edges 34 embody the necessary relief and the leading faces 28 of the blades intersect the forward ends of the teeth 36 so that the latter present sharp cutting points to the work being grooved. Teeth 36 may be 'sharpened by merely grinding the leading faces 28 in slight degrees. Thus, the blades 26 may be repeatedly ground to maintain the teeth 36 in a sharpened condition over a relatively long period of time. In addition, the spacing between the teeth 26 is such as to provide accommodation for particles which may be cut from the shoe sole or other work. The spaces are of such extent as to readily accommodate suitable grinding tools for sharpening purposes. The longitudinal axes of the teeth 36 are arranged at acute angles to their respective leading faces 28 so that grinding away material on the leading faces will provide the leading ends of the teeth with sharp points capable of cutting clean grooves.

With the cutter of Figs. 1 and 2 rotating in the direction of the arrows 32, extension I6 having the right hand threads will be threaded into the bore in the left hand end of the edge trimmer shaft when viewed from the operators position, so that the extension will thread tightly into the bore for maintaining its end of the cutter tight against the end of the shaft. Similarly, the extension I8 is threaded into the bore in the left hand end of the edge trimmer shaft so as to maintain effective connection between the cutter and the shaft. Thus, I provide a cutter which may be threadedly connected with either end of the edge trimmer shaft, which shaft rotates in one direction only.

Fig. 3 illustrates a cylindrical body 36 having blades 38 identical with the blades 26, with the cylindrical body provided with a longitudinal bore 40 for the reception of a bolt 42 adapted to thread into the bore 44 in the edge trimmer shaft 46. Cylindrical body 36 is provided with an enlarged bore 48 in each end, and the edge trimmer shaft 46 is provided with a smaller diameter shank 50 at each end of the same diameters as the bores 48. The bores 48 are of such diameter and depth as to completely house the head 52 of the bolt, which head may be provided with a slot 54 for the reception of an instrument, such as a screw driver, to facilitate threading of the bolt into the bore 44 of the edge trimmer shaft.

In Fig. 3, I illustrate the edge trimmer shaft 46 as rotating in the direction of the arrow 32, with the cutter mounted on the left hand end of the shaft. Bolt 42 is provided with right hand threads so that the cutter will be maintained in effective connected relation with the shaft. Similarly, when the cutter is mounted on the right hand end of the edge trimmer shaft 46, a bolt having left hand threads will be utilized.

Fig. 4 illustrates a cutter including a cylindrical body 56 and toothed blades 58 identical with the blades 26 of Figs. 1 and 2. Body 56 is provided with threaded bores 60 coaxially arranged with respect to the axis of the body for the reception of stud bolts 62 and 64. Each bolt includes a nut part 66 adapted to be drawn against its respective end face 68 of the body 56, and the stud bolt 62 includes a threaded shank I6 threaded into its respective bore 60, while the bolt 64 includes a threaded shank I2 threaded into its respective bore 60. Shank I0 is provided with right hand threads, while shank I2 includes left hand threads. Screw 62 includes a bolt extension 16 having right hand threads I8, and bolt 64 includes a bolt extension 80 having left hand threads 82. Fig. 4 illustrates the nut part 66 of the stud bolt 62 as being arranged in abutting relation with the reduced diameter extension 50 On the left hand end of the edge trimmer shaft 46. Screw 64 is employed for connecting the cutter with the right hand end of the edge trimmer shaft.

Fig. 5 illustrates a cylindrical body 84 provided with a series of longitudinally and radially arranged slots 86 into which relatively thin blades 88 are disposed, with the blades projecting considerable margins beyond the circumferential face 90 of the cylindrical body. The blades are provided with groove cutting teeth 92. According to Fig. 5, the cylindrical body 84 is provided with reduced diameter extensions 94 at its ends to provide shoulders 96. Blades 86 have lengths exactly equaling the length of the cylindrical body 84 between the shoulders 96, and the ends of the blades are precisely aligned with the shoulders and made secure by electric welding 98. Thus, the blades 86 are effectively securedagainst accidental endwise shifting so that the teeth 92 will remain perfectly aligned for cutting clean grooves.

The ends of the cylindrical body 84 are provided with bores I00 conforming to the bores 48 of Fig. 3, and the cylindrical body is also provided with a longitudinal bore I02, which corre-v sponds to the bore 40 of Fig. 3, for the reception of a bolt I04. Fig. 5 illustrates the bolt I04 as being provided with left hand threads I06 to be threaded into the bore I68 in the right hand end of the edge trimmer shaft IIO. Blades 86 are relatively thin, and the cylinder 84 is designed for connection with either end of the edge trimmer shaft I I0, or the cutter may be reversed end to end at one end of the shaft, so that the cutter may bereversed to present the opposite faces of the blades to the work as the cutter is rotated. Thus, the cutter may be operated until such time as the teeth are dulled on one face of the blades, after which the cutter is reversed for presenting the opposite faces of the blades, or ends of the teeth, to the work. Accordingly, the cutter may be reversed from time to time to present the opposite faces of the blades to the work.

Figs. 7- and 8 illustrate a different form of construction wherein the cylindrical body I I2 is diecast about considerable margins of relatively thin blades I I4 of the type illustrated in Figs. 5 and 6, which blades are provided With grooving teeth I I6. Blades II4 have their ends angled outward- 1y, as at I I8 in Fig. 7, so that the margins of the blades embedded in the cylinder II2 take the form of dovetail tenons when viewed according to Fig. 7. Thus, the blades I I4 are effectively retained inside the material of the cylinder 2.

A shaft I20 is incorporated inside the cylinder I I2 at the time of die-casting, and the shaft may be provided with suitable keys I22 to prevent unloosening of the cylinder with respect to the shaft. The shaft is of greater length than the cylinder II2 to provide extensions I24 and I26, which extensions are illustrated with right hand threads for connection with the left hand end of the edge trimmer shaft, thus permitting the cutter to be reversed on that end of the shaft.

In Figs. 9 and 10, I illustrate a cutter in which the blades I28, identical with the blades II4 of Figs. '1 and 8, have margins embedded in a diecast sleeve I30, the bore I32 of which is of such diameter as to receive the edge trimmer shaft. Sleeve I30 is provided with set screws I34 for fixedly relating the sleeve to the shaft.

Figs. 11 and 12 illustrate a cylindrical body I36 which carries a plurality of blades I38 having groove cutting teeth I40 identical With the teeth of Figs. to 10, inclusive. Blades I38 have angular ends I42 which extend slightly beyond the ends I44 of the cylindrical body. The cylindrical body is provided with longitudinal slots I46 for the reception of the greater margins of the blades I38, and the slots I46 lead into bores I48 which snugly receive the curled inner edges I50 of the blades.

Fig. 11 illustrates the cylindrical body I36 as being provided with threaded bores I52 for the reception of threaded shanks I54, and I56, respectively. Shanks I54 and I56 comprise threaded runs on stud bolts I58 and I60, respectively, which stud bolts are respectively provided with threaded shanks I62 and I64. The stud bolts I58 and I60 are provided with flanges I66 which abut their respective ends of the cylindrical body I36 and are provided with threads I68 on their peripheral surfaces for reception of nuts I having concaved faces I12 angled to engage the angular ends I42 of the blades I38. Nuts I10 are provided with bores I14 for the reception of a spanner wrench to facilitate tightening.

Blades I38 are of equal lengths so that the blades will be perfectly aligned when the nuts I10 are tightened, with the teeth I40 in the blades precisely aligned for groove cutting purposes. Shanks I62 and I64 are provided with right hand threads so that either shank may be threaded into a bore in the left hand end of the edge trimmer shaft. Thus, the cutter of Figs. 11

and 12 may be reversed on the left hand end of the edge trimmer shaft. Shanks I54 and I56 are also provided with right hand threads. Blades I38 are fixedly related to the cylindrical body I36 by reason of the nuts I10, and the blades may be removed from the cylindrical body by removing one of the nuts I10, thus permitting substitution of blades in the event of damage'to blades in the cutter.

Figs. 13 and 14 illustrate another form in which the blades I16 are identical with the blades I38, but in which the blades are carried by a sleeve I18 provided with a bore I86 for reception of the edge trimmer shaft. Sleeve I18 is slotted at I82 and provided with communicating bores i84 for respective reception of the blades and their turned edges I86 in the manner of the blades and cylinder structure of Figs. 11 and 12.

Referring to Fig. 13, the angular ends I88 of the blades are engaged by the concaved faces I90 of pressure washers I92 having bores I94 of the same diameters as the bore I80. Collars I96 are adapted to be mounted on the edge trimmer shaft and to be fixedly related to the shaft by set screws I68. Collars I96 are threaded at 200 for threaded connection with nuts 202 arranged to press against the clamping washers I92 for urging the latter against the ends of the blades I16. Nuts 202 are provided with bores 204 for the reception of a spanner wrench. Thus, the cutter of Figs. 13 and 14 may be mounted on the edge trimmer shaft in the same manner as the cutter of Figs. 9 and 10.

Figs. and 16 illustrate a cutter in which the blades 206 are cast integrally with a sleeve 208 having a bore 2 I0 fashioned to receive the finisher shaft (not shown). Blades 206 are provided with groove cutting teeth 2I2 aligned to cut grooves in the same manner as the foregoing cutters, and the sleeve 208 may be fixedly related to the finisher shaft by set screws 2I2. Blades 206 are relatively thin to operate in the same manner as the thin blades of Figs, 5 to 14, inclusive.

Having thus described certain embodiments of my invention in detail, it is, of course, understood that I do not desire to limit the scope thereof to the exact details set forth except in so far as those details may be defined in the appended claim.

I claim:

In a machine for grooving shoe soles, a cutter comprising a cylindrical body, blades extending longitudinally of the cylindrical body and provided with grooving teeth, said cylindrical body being provided with a longitudinal bore and enlarged bores at its ends, a drive shaft having an end adapted to be inserted in one of said enlarged bores and an axial threaded bore, and a bolt extending through the bore in the cylindrical body and threaded into the bore in said drive shaft for connecting the cylindrical body with the drive shaft, the head of the bolt being adapted to be housed inside the enlarged bore in the opposite end of the cylindrical body.

GEORGE C. BENNETT. 

